May I ask some quetions? Which version do you use? It is clearly a Breakpoint Views workflow, not Fluid Boxes. You talk about a 'responsive template'. Do you mean a responsive theme? AFAIK no templates are packaged with Adobe Captivate. Or are you talking about a template from an external source like eLearning Brothers? If yes, please ask about it in their website.
For Breakpoint views the font sizes for each breakpoint are defined in the Object Style Manager: can you check and eventually edit to a lower font size?
Size and location of all items are defined in the Position Properties.